Haier HSU-12LEK03-Y3 User Manual

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Please read this operation manual before using the air conditioner.

Keep this operation manual for future reference.

SPLIT TYPE ROOM AIR CONDITIONER

OPERATION MANUAL

0010518786

Contents

1

2-4

5

7

6.7

CAUTIONS

PARTS AND FUNCTIONS

OPERATION

MAINTENANCE

TROUBLE SHOOTING

HSU-09HEK03

HSU-09LEK03

HSU-12HEK03

HSU-12LEK03

HSU-09LEK13

HSU-12LEK13

HSU-07LEK03

HSU-07HEK03

HSU-18LEK13

HSU-24LEK13

HSU-12LEK13-M

HSU-18HEK03

HSU-24HEK03

HSU-18LK2S3

HSU-12LEK03-Y3

HSU-24LK2S3

HSU-18LEK03-Y3

HSU-24LEK03-Y2

HSU-09CK2S3

HSU-09LEK03-Y3

HSU-12CK2S3

HSU-09CK2W3

HSU-09CK6B3

HSU-12CK2W3

HSU-12CK6B3

HSU-18LK2W3

HSU-18LK6B3

SAS-09HEK3

SAS-12HEK3

SAS-18HEK3

SAS-24HEK3

HSU-12LEK03-Y5

HSU-09LEK03-Y5

HSU-12LH03

HSU-09LH03

HSU-18LEK03-Y5

HSU-18LH03

HSU-24LEK03-Y5

HSU-24LH03

HSU-12HH03

HSU-09HH03

HSU-18HH03

HSU-24HH03

HSU-12HEG03

HSU-09HEG03

HSU-18HEG03

HSU-24HEG03

HSU-12LEK03-Y6

HSU-18LEK03-Y6

HSU-12LEK03-Y2

HSU-24LEK03-Y3

HSU-09LEK03-Y2

HSU-18LEK03-Y2

YKS-18HEK03

YKS-24HEK03

HSU-18LEK03

HSU-24LEK03-Y6

HSU-12LEK03-Y4

HSU-18LEK03-Y4

HSU-24LEK03-Y4

HSU-09LEK03-Y4

HSU-09LEK03-Y6

HSU-18LK2W3

HSU-18LK6B2

HSU-24LK2S2

HSU-12CK6B2

HSU-24LEK03

HSU-18LEK03EK1

HSU-26HEK03

Table of Contents

Other manuals for Haier HSU-12LEK03-Y3

Installation Manual4 pages

Questions and Answers:

T
Teresa PhillipsAug 14, 2025
Why is my Haier Air Conditioner cooling poorly?
- M
  monica55Aug 14, 2025
  Poor cooling in your Haier Air Conditioner can stem from several factors. First, check if the air filter is dirty and clean it, ideally every 15 days. Ensure there are no obstructions blocking the air inlet or outlet. Verify that the temperature is set correctly and that all doors and windows are closed tightly. Direct sunlight can also impact cooling efficiency, so use curtains to block it. Finally, consider if there are excessive heat sources or too many people in the room.
J
Jordan VasquezAug 17, 2025
Why is my Haier HSU-12LEK03-Y3 Air Conditioner not cooling well?
- A
  amandaowensAug 17, 2025
  There are several reasons why your Haier Air Conditioner might not be cooling effectively. Check if the air filter is dirty and clean it, normally it should be cleaned every 15 days. Ensure there are no obstacles blocking the air inlet and outlet. Verify that the temperature is set correctly. Make sure all doors and windows are closed. Use curtains to block direct sunlight. Reduce heat sources or the number of people in the room.
G
gillkiaraAug 20, 2025
How to fix Haier HSU-12LEK03-Y3 not restarting immediately?
- J
  James CarpenterAug 20, 2025
  When the unit is stopped, it won't restart immediately until 3 minutes have elapsed to protect the system. When the electric plug is pulled out and reinserted, the protection circuit will work for 3 minutes to protect the air conditioner.
R
roweclaudiaAug 25, 2025
Why is my Haier HSU-12LEK03-Y3 making noise?
- K
  Kristen LeAug 25, 2025
  The swishing or gurgling noise you hear in your Haier Air Conditioner is typically refrigerant flowing through the system. You might notice it more within the first few minutes after starting the unit. Also, cracking noises can occur as the unit's casing expands or shrinks due to temperature fluctuations. If you notice a big noise from air flow, the air filter may be too dirty.
A
Anthony BradfordAug 27, 2025
Why won't my Haier HSU-12LEK03-Y3 Air Conditioner restart immediately?
- E
  Eric HornAug 28, 2025
  If your Haier Air Conditioner doesn't restart immediately after being stopped, it's due to a built-in protection mechanism. The system requires a 3-minute delay before restarting to safeguard the unit. If you unplug and re-plug the air conditioner, this protection circuit activates, preventing immediate restart for about 3 minutes.
E
Elizabeth SuttonAug 31, 2025
Why does my Haier Air Conditioner generate smells?
- A
  Andrea PaulAug 31, 2025
  Smells from your Haier Air Conditioner can occur when the system circulates odors from the room, such as those from furniture, paint, or cigarettes.
L
Linda CraigSep 3, 2025
Why can’t I change the fan speed in dry mode on my Haier HSU-12LEK03-Y3?
- J
  Jason RobertsonSep 3, 2025
  In DRY mode, the fan speed of your Haier Air Conditioner cannot be changed because when the room temperature drops below the set temperature plus 2 degrees Celsius, the unit will run intermittently at low speed, regardless of the fan setting.
H
Hector JonesSep 6, 2025
Why does my Haier HSU-12LEK03-Y3 Air Conditioner make noise?
- L
  longchristopherSep 6, 2025
  During operation, a swishing or gurgling noise may be heard, especially in the first 2-3 minutes after starting, due to refrigerant flowing in the system. A cracking noise may occur because the casing expands or shrinks due to temperature changes. If there's a big noise from air flow, the air filter may be too dirty.
M
michelle04Sep 9, 2025
Why can't I change the fan speed in dry mode on my Haier HSU-12LEK03-Y3?
- P
  paulavazquezSep 10, 2025
  In DRY mode, when the room temperature becomes lower than the set temperature plus 2 degrees Celsius, the unit will run intermittently at LOW speed regardless of the FAN setting.

Haier HSU-12LEK03-Y3 Specifications

General

Refrigerant	R410A
Power Supply	220-240V, 50Hz
Type	Split AC
Cooling Capacity	12000 BTU/hr
Operating Temperature (Cooling)	18°C to 43°C
Noise Level (Indoor/Outdoor)	50 dB

Summary

Parts Identification

Indoor Unit Components

Details the various parts and indicators of the indoor air conditioner unit.

Remote Controller Components

Describes the buttons and displays on the remote control for operating the unit.

Outdoor Unit Components

Identifies the key parts of the outdoor unit of the air conditioner.

Clock Setting Procedure

Remote Battery Installation

Operation Modes and Controls

Unit Start and Stop

Instructions on how to turn the air conditioner unit on or off using the main button.

Auto Operation

Explains automatic selection of cooling or heating based on room temperature.

Cooling Operation

Details how to operate the unit in cooling mode for temperature regulation.

Dry Operation

Describes the dehumidification mode for reducing indoor humidity.

Advanced Operation Features

HEALTH Operation

Information on the anion generator function for air purification.

Timer Operation

Guide for setting automatic start or stop times for the unit.

Emergency and Test Operation

Procedures for operating the unit without a remote or for testing functions.

Sleep Mode and Power Management

Comfortable Sleep Mode

Explanation of the sleep mode to adjust temperature for comfortable rest.

Power Failure Resume Function

Details how the unit behaves after a power interruption and resume.

Maintenance Guidelines

General Maintenance Tips

Advice on setting temperature, cleaning, and using the timer effectively.

Air Purifying Filter Replacement

Step-by-step instructions for cleaning and replacing air filters.

Safety Cautions and Warnings

Installation Warnings

Critical safety warnings regarding installation and electrical connections.

Operational Safety Precautions

Precautions for safe operation, including avoiding water and proper usage.

Troubleshooting Common Issues

Normal Performance Checks

Addresses normal noises, smells, and mist during operation.

Poor Cooling and System Checks

Diagnoses issues related to cooling performance and multiple system checks.

Applicable Ambient Temperature Range

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